Combination lock



July 14, 1925. Y 1,546,333

` K. WRTMANN/ COMBINATION Locx Filed sept. 12. 1924 mm1 my;

KAR-L WRTMANN, UF MUNICH, GERMANY.

COMBINATION LOCK.

Application filed September 1,2, 1924. Serial No. 737,339.

T0 ZZ fruito/in t may concern.'

Be it known that l, Kann lVn'rMnNN, a citizen ot the German Republic, residing at Munich, Germany hare invented certain new and useful improvements in Combina. tion Locks, ot which the following is a specilication.

This invention relates to a combination lock with several rotatable bolts which are juxtaposed, marked with i usting sigi-is and designed to secure a locking rod one end ot which locks the locking bolt, the other end of said rod forming an adjusting handle.

rllheI invention has 'for its object on the one hand to simplify the manipulation et the locking bolt by this bolt being automatically rotated int-o the open position and on the other hand to permit oit opening the lock even it' the secret number to which the rotatable bolts have been adjusted has been i'brgotten.

ylhese objects are attained according to the invention by controlling the locking bolt made in one piece by a resilient traction member acting between the two arn'ls ot the U-shaped lock bow, said traction member making the locking bolt oscillate in horizontal direction when the saine is being released.v The heads ot the rotatable bolts are round and have each looking pins adapted to be shifted in opposite directions and designed to come in engagement with the caps of the locking bolts, ot polygonal cross sec tion and marked with the adjusting signs, when the locking rod is in the open position so that this looking rod can be looked in position with the aid ot the signs on the caps.

An embodiment ot the invention is shown by way ot example on the accompanying drawings, in which:

Fig. l is a trout elevation.

Q shows the head ot the rotatable locha bolt with the cap which is shown in section.

Fig. 23 is a section on line ltrot Fig. l.

Fig. t shows the position adopted by the caps ot the rotatable bolts at the open position olf the lock.

rEhe safety look which is made in diti'erit sizes and especially designed 'tor the locking ot bicycles, motorcycles and motor cars consists ot a U-shaped bow o an opening between the arms ot which is adapted to be locked by a bolt b. In the lower arm oit bow o a locking bolt o controlled by a spring e is rotatably andvshiftable mounted, the rear end ot said looking bolt o forming an adjusting handle l and the iront end ot the saine engaging with an annular groove in the corresponding end ot' the locking bolt b. @ver the locking bolt or rod c transversely to the saine a convenient number et juxtaposed rotatable bolts f are arranged which have each an incision designed to engage with the flattened part ot the locking rod. The locking rod has annular grooves, one tor each rotatable bolt. f

The heads z' of the rotatable bolts f bearing against the youter surface ot the lower arm of the U-shaped bow a are round and covered each by a cap g ot polygonal, preterably hexagonal cross section. According to the invention each head z' has a central cross bore 7c in which two locking pins Z are niovably mounted the outer ends of which are conical. Between every two locking pins Z a spiral spring fm, is located which pushes said looking pins permanentlyy in outward direction so that their conical or pointed ends slide upon the inner surface ot the corresponding cap g.

The heads i of the rotatable bolts j project each with an extension through the corresponding cap and have a mark n on the outer surface of the extension (Fig.v 4). rlfhe adjusting head ci of the locking rod o has also a mark n on its outer surface. The lock can be 'opened when all the marks n are properly adjusted according to a secret key which is in possession of the proprietor of the lock.

The looking bolt ZJ is cylindrical or of angular cross section. Its-tree end engages with an aperture 0 of the upper arm of the U-shaped b'ow aand bears against an abutinent p. A rope or chain g attached with one endto said locking bolt t engages with an angular Ygroove r ot the upper arm ot the U-shaped bow and is with its other end attached to a pull spring 8. A pin t is arranged in the upper arm ot the U-shaped bow a at a convenient point. l

Vhen the rotatable bolts 7 have been ad# justed so that the 'flattened part ot' the lockf ing bolt c coincides with the grooves ont the rotatable bolts the lock can be opened by pulling out the locking rodc. `When the locking bolt o has been released by the locking rod c the spring 8 begins t0 act in pulling said locking bolt first in upward direction and making the saine then Oscillate Vthrough 900 in the aperture 0 to pull it in the horizontal direction backward so that the locking bolt is parallel with the upper arm of the Usshaped bow a -as shown in Fig. l in dash and dot lines. The end of the chain Q attached to the locking bolt bears in this position of the locking bolt against the stop pin t so that the lookingbolt isstopped. The unlocking of the locking bolt, the pulling of the same in upward directionand the pulling back of the same in horizontal di reotion which up to the present Vrequired three different manipulations'is now automatically effected in one single operation.

The coupling between the rotatable bolts f, i and the caps g can be-eilected with the aid of the locking pins Z the conical ends oi which engage Vwith the corners in the caps so that the elements ot the lock can beV adjusted to the position in which the corresponding faces ofthe caps are situated in one plane with the faces of the .arms of the U-shaped bow even when the secret number of the lock has been forgotten. In suc-h a case the marks n, of the rotatable bolts are adjusted by rotating the caps g-according'to the prescriptions oit the secret key whereby Ythe locking :rod andthe rotatable bolts are adjusted to the open position.

'lVhen the lock is open said two parts are rendered immovable so'that the caps g alone can be rotated in overconiing theV resistance of spring m .and in pre-ssing back the locking pins Z to be adjusted to a new secret number. As .the 'marks ,n are provided .on therotatable 'bolts which at the open position =must always adopt the same position the last adjusted secret 'number will 'always appear whenithelook 'isbeing opened even it' the oaps'have beenrotated 4in the meantime.

I claimt#d l. A combinationloek comprising in ieombination a Ueshaped bow, 'a'lockin'g bolt designed .to lock the free ends of the arms of said Usshaped bow, a looking rod in the l'owerarm of said U-.shapedY bow designed to lock said locking bolt, rotatable bolts Vcooperating with said locking rod, round heads one for eachrotatablebolt, a cap of polygonal cross sectionV on each rotatablebolt, and releasablemeans in said heads of the rotatable bolts for locking the same in position in the corresponding caps.

2. A combination lock comprising` in combination a U-shapedbow, a locking bolt designed ;tolock the free endsof the arms of said U-shaped bow, a locking lrod in lthe lower arm of said U-shaped bow designed to lock .said looking bola-'rotatable bolts cooperating with said v`-locking rod, round heads one for each rotatable bolt having a transverse bore, a cap of polygonal cross section on each rotatable bolt, two locking -pins with conical outer ends movably mounted in the transverse bore of each head of each rotatable bolt and a spiral spring located in said bore between said two locking pins to push the same in outward direction and 'to bring the conical ends in engagement with the inner surface oi the corresponding cap.

3. A combination lock comprising in combination a U-shaped bow, a looking bolt designed to lock the free ends of the arms of said U-shaped bow, a locking rod in thel lower arm of said U-shaped bow designed to lock said locking bolt, rotatable bolts cooperating with said locking rod, round heads one for each rotatable bolt, a cap of polygonal cross section on each rotatable bolt and releasable means in said heads of the rotatable bolts ior locking the same in position in the corresponding caps, an adjusting handle in the outer end of said locking rod and a markonthe outer surfacefot said adjusting handle, said mark beingy designed lto indicate the open position ot the elements of the loch.

t. A combination lock comprising in combination a U-shaped bow having an aperture in the end ot its upper arm and an angular groove in the lowersurface of said upper arm, a locking bolt designed to look the free ends ci the arms oit said U-shaped bow, a locking rod inthe lower=armfot said U-shaped bow designed to lock said locking bolt, rotatable boltscooperating 'with said looking rod, round heads one for-each 'rotatable bolt, a cap of polygonal cross'section on each rotatable bolt and releasable means in said lheads of the rotatable bolts for locking the same in 'position in the correspond# ing caps, a pull springlocated in said upper arm or theU-shaped1bow, a chain attached with one end to -said docking bolt and with the other -end tosaid pull spring, said pull spring beingdesigned to pull said bolt when it has been released at rst in upwar-d'direction, then Vto oscillate it'through 90o in said aperture at the 'front end of the 'upper arn'i ot the U-shaped bow and to pull it back finally in lhorizontal direction, all these movements being execute-d automatically at the releasing of the locking bolt.

In testimony whereof I aliiX my signature in presence of two witnesses.

KARL WRTMANN.

.lVitnesses ALEXANDER Parr, JosnrLANNMrL-LER. 

